Acclimation of photosynthetic properties in psychrophilic diatom isolates under different light intensities
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概要
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Acclimation of growth and photosynthetic properties was examined for diatom strains, isolated from Saroma Ko lagoon (44°N, 144°E) in early spring, under different light intensities at 1℃. The relatively high specific growth constants under low irradiances were recognized for both Chaetoceros sp. and Thalassiosira sp. Further examination of photosynthesis in Chaetoceros sp. showed that growth under low irradiance caused an increase in the photosynthetic effciency for Chl α-specific rate of gross O_2 evolution (α^B) and a decrease in the Chl α-specific rate of dark O_2 respiration (R_d^B), which was extrapolated from the initial slope of net O_2 evolution rate vs. irradiance curve. These changes explain the low light compensation point for net photosynthetic O_2 evolution (I_c) and the high efficiency for growth under low irradiance conditions. Neither Chl α-specific amounts of light-harvesting pigments, such as fucoxanthin and Chl c, nor cellular content of Chl α, but Chl α-specific amount of diadinoxanthin was varied by the change in irradiance condition. The increase of α^B under low growth irradiance corresponded with a decrease in the amount of diadinoxanthin relative to Chl α. However, the Chl α-specific maximum photosynthetic rate (P_m^B) was retained at the same level and photoinhibition could not be observed under illumination up to ∿800μE m^<-2> s^<-1>. The light intensity at which photosynthesis was light-saturated (I_k, =P_m^B/α^B) was much higher than the incident growth irradiances (76 and 88μE m^<-2> s^<-1> under the growth irradiances of 11 and 42 μE m^<-2> s^<-1>, respectively), although the value of I_k for the former was significantly smaller (t-test, P<0.001) than that for the latter. Thus, the capacity of photochemical reaction around photosystems seems to remain large even under low irradiance. These properties may indicate that the diatom cells could efficiently utilize light-energy under large variation of irradiance even on a short time-scale.
- 国立極地研究所の論文
著者
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Watanabe Kentaro
National Institute of Polar Research, Kaga 1-chome, Itabashi-ku, Tokyo 173-8515, Japan
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Kudoh Sakae
National Institute of Polar Research, Kaga 1-chome, Itabashi-ku, Tokyo 173-8515, Japan
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Fukuchi Mitsuo
National Institute of Polar Research, 10-3 Midori-cho, Tachikawa-shi, Tokyo 190-8518, Japan
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Kudoh Sakae
National Institute Of Polar Research Kaga 1-chome Itabashi-ku Tokyo 173-8515 Japan
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Kudoh Sakae
National Institute Of Polar Research
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Imura Satoshi
National Institute of Polar Research
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Kashino Yasuhiro
Department Of Life Science University Of Hyogo 3-2-1 Kohto Kamigohri Ako-gun Hyogo 678-1297 Japan
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Kashino Yasuhiro
Dept. Life Sci. Fac. Sci. Himeji Inst. Tech. Harima Science Garden City
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Ikeya Tohru
National Institute of Polar Research
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Kashino Yasuhiro
Faculty of Science, Himeji Institute of Technology
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Kashino Yasuhiro
Faculty Of Science Department Of Life Science Himeji Institute Of Technology
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Watanabe Kentaro
National Institute Of Polar Research
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Watanabe K
National Institute Of Polar Research Kaga 1-chome Itabashi-ku Tokyo 173-8515 Japan
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Fukuchi M
National Institute Of Polar Research 10-3 Midori-cho Tachikawa-shi Tokyo 190-8518 Japan
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Fukuchi M
National Inst. Polar Res. Tokyo
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Imura Satoshi
National Inst. Polar Res. Tokyo
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Fukuchi Mitsuo
National Inst. Of Polar Res. Kaga Tokyo 173-8515 Jpn
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Ikeya T
Univ. Tokyo Tokyo
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Fukuchi Mitsuo
National Inst. Of Polar Res. 10-3 Midori-cho Tachikawa Tokyo 190-8518 Jpn
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Kudoh Sakae
National Inst. Of Polar Res. 10-3 Midoricho Tachikawa Tokyo 190-8518 Jpn
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